US7493371B1 - Using a client-server connection protocol to establish a peer-to-peer connection - Google Patents
Using a client-server connection protocol to establish a peer-to-peer connection Download PDFInfo
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- US7493371B1 US7493371B1 US10/816,336 US81633604A US7493371B1 US 7493371 B1 US7493371 B1 US 7493371B1 US 81633604 A US81633604 A US 81633604A US 7493371 B1 US7493371 B1 US 7493371B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
Definitions
- Embodiments of the invention relate to establishing a peer-to-peer connection between two nodes in a communications network.
- Communications protocols may define connection methods to be used when establishing a connection between two nodes in a communications network.
- the connection method may be based on the relationship between the two nodes being connected.
- a communications protocol may define a client-server connection method to be used if the two nodes being connected have a client-server relationship, and a peer-to-peer connection method to be used if the two nodes being connected have a peer-to-peer relationship.
- the client-server connection method may be simpler, it is desirable to use the client-server connection method even if the two nodes being connected have a peer-to-peer relationship.
- VI Virtual Interface
- OS Operating System
- the VI protocol can run over any interconnect that supports the VI protocol.
- the VI protocol may run over the Fibre Channel (FC) interconnect, or the Infiniband interconnect.
- FC Fibre Channel
- the VI protocol defines two types of VI connection methods, namely the client-server, and the peer-to-peer connection methods. When the end points in a VI connection have a peer relationship, it is natural to set up the VI connection using the peer-to-peer method. However, the client-server method is much simpler to implement than the peer-to-peer method because the client-server connection method has a simpler state machine.
- the invention provides a method for establishing a point-to-point link between two peer nodes in a communications network.
- one of the client and server role is assigned to each of the two nodes based on a rule.
- the point-to-point link is established between the two nodes based on a predefined client-server connection protocol.
- FIG. 1 shows a communications network comprising two peer nodes between which a point-to-point link is to be established
- FIG. 2 shows a flowchart of operations performed when establishing a point-to-point link between the two peer nodes of FIG. 1 , in accordance with one embodiment of the invention
- FIG. 3 shows a generalized architecture for the nodes of FIG. 1 , when the nodes define FC-VI ports;
- FIG. 4 shows a flowchart of operations performed when establishing a peer-to-peer connection between two peer FC-VI ports, in accordance with one embodiment of the invention
- FIG. 5 shows a flowchart of operations performed by a first port in a communications network when establishing a point-to-point link with a second port in the communications network, in accordance with one embodiment of the invention.
- FIG. 6 shows a high level block diagram of hardware that may be used to implement the nodes of FIG. 1 , in accordance with one embodiment of the invention.
- Embodiments of the invention disclose a technique for establishing a point-to-point link between two peer nodes in a communications network using a client-server connection protocol, instead of a peer-to-peer connection protocol.
- Embodiments of the present invention may be used to establish a peer-to-peer connection between two peer FC-VI ports using the client-server connection method/protocol defined in the VI specification instead of the peer-to-per connection method/protocol defined in the VI specification.
- establishing the peer-to-peer connection between the to FC-VI ports is simplified since the client-server connection protocol defined in the VI specification is simpler than the peer-to-peer connection protocol defined in the VI specification.
- reference numeral 100 , 102 generally indicates two peer nodes in a communications network, between which a point-to-point link 104 is to be established.
- Each peer node 100 , 102 supports a communication protocol that defines a peer-to-peer connection method and a client-server connection method.
- the peer-to-peer connection method is to be used since the nodes 100 , 102 have a peer-to-peer relationship.
- the client-server connection method is ordinarily not an option in this case since it requires the two nodes being connected to have a client-server relationship.
- IP Internet Protocol
- the peer node 102 has an IP address of 1.2.3.5.
- FIG. 2 of the drawings shows a flowchart of operations performed when establishing a point-to-point link between the two peer nodes 100 , 102 shown in FIG. 1 of the drawings, in accordance with one embodiment of the invention.
- one of a client and a server role is dynamically assigned to each of the peer nodes 100 , 102 based on a rule.
- the rule relies on system level knowledge to assign the client and the server roles.
- Embodiments of the invention may include predefining the rule.
- the rule may assign the client and server roles based on a numeric value of the network address of the two nodes.
- the rule may specify that the node 100 with a smaller network address gets assigned the role of the client, whereas the node 102 with the larger network address gets assigned the role of the server.
- the node with the network address 1.2.3.4 will get assigned the role of the client, whereas the node with the network address 1.2.3.5 will get assigned the role of the server.
- a point-to-point link is established between the two nodes based on a predefined client-server connection protocol/method.
- each node 100 , 102 may each define an FC-VI port each having the generalized architecture shown in FIG. 3 of the drawings.
- each node 100 , 102 includes an interconnect module 300 which implements an interconnect to support the VI protocol.
- the interconnect module may support the FC, or the Infiniband protocols.
- a VI network adaptor 302 implements VI functionality in conjunction with a VI User Interface (UI) 304 that is disposed between the VI network adaptor 302 , and an application 306 that uses the VI protocol.
- UI VI User Interface
- FIG. 4 of the drawings there is shown a flowchart of operations performed when establishing a peer-to-peer connection between the two peer FC-VI ports shown in FIG. 1 of the drawings.
- one of a client and server role is dynamically assigned to each of the two FC-VI ports 100 , 102 .
- a peer-to-peer connection is established between the two peer FC-VI ports 100 , 102 in accordance with the client-server connection protocol defined in the VI specification, wherein the port assigned the client role sends a connection request to the port assigned the server role, the port assigned the server role accepts the connection request, and the port assigned the client role acknowledges the acceptance of the request.
- dynamically assigning the client and server roles comprises performing a comparison of the network addresses of the two peer FC-VI ports 100 , 102 , and assigning the client and server roles based on the comparison. For example, the FC-VI port with the numerically higher value may be assigned the role of the server, whereas the FC-VI port with the numerically lower value may be assigned the role of the client.
- FIG. 5 of the drawings shows a flowchart of operations performed by a first port (i.e., the node 100 ) in the communications network shown in FIG. 1 to establish a point-to-point link with a second port in the communications network (i.e., the port 102 in FIG. 1 of the drawings), which second port is a peer of the first port.
- the first port determines unique identifying information for the first and second ports. For example, in one embodiment this unique identifying information may comprise the network addresses of the first and second ports, respectively.
- the first port (node 100 ) assigns one of a client and server role for itself based on a rule applied to the unique identifying information.
- the rule may specify that the port with the numerically higher network address may be assigned the server role, whereas the port with the numerically lower network address may be assigned the client role.
- the first port (node 100 ) establishes a point-to-point link using a client-server connection protocol which operates as follows. If the first port (node 100 ) is assigned a client role, then the first port sends a connection request to the second port (node 102 ). Alternatively, if the first port (node 100 ) is assigned the server role, then the first port waits for a connection request from the second port (node 102 ).
- the result is that one of the first port and the second port will be assigned the server role, and one of the first port and the second port will be assigned the client role.
- the port assigned the client role will wait for the other port to send a connection request, whereas the port assigned server role will send a connection request to the other port.
- reference numeral 600 generally indicates hardware that may be used to implement the nodes 100 , 102 in accordance with one embodiment.
- the hardware 600 typically includes at least one processor 602 coupled to a memory 604 .
- the processor 602 may represent one or more processors (e.g., microprocessors), and the memory 604 may represent random access memory (RAM) devices comprising a main storage of the hardware 600 , as well as any supplemental levels of memory e.g., cache memories, non-volatile or back-up memories (e.g. programmable or flash memories), read-only memories, etc.
- the memory 604 may be considered to include memory storage physically located elsewhere in the hardware 600 , e.g. any cache memory in the processor 602 , as well as any storage capacity used as a virtual memory, e.g., as stored on a mass storage device 610 .
- the hardware 600 also typically receives a number of inputs and outputs for communicating information externally.
- the hardware 600 may include one or more user input devices 606 (e.g., a keyboard, a mouse, etc.) and a display 608 (e.g., a Cathode Ray Tube (CRT) monitor, a Liquid Crystal Display (LCD) panel).
- user input devices 606 e.g., a keyboard, a mouse, etc.
- a display 608 e.g., a Cathode Ray Tube (CRT) monitor, a Liquid Crystal Display (LCD) panel.
- CTR Cathode Ray Tube
- LCD Liquid Crystal Display
- the hardware 600 may also include one or more mass storage devices 610 , e.g., a floppy or other removable disk drive, a hard disk drive, a Direct Access Storage Device (DASD), an optical drive (e.g. a Compact Disk (CD) drive, a Digital Versatile Disk (DVD) drive, etc.) and/or a tape drive, among others.
- the hardware 400 may include an interface with one or more networks 612 (e.g., a local area network (LAN), a wide area network (WAN), a wireless network, and/or the Internet among others) to permit the communication of information with other computers coupled to the networks.
- networks 612 e.g., a local area network (LAN), a wide area network (WAN), a wireless network, and/or the Internet among others
- the hardware 600 typically includes suitable analog and/or digital interfaces between the processor 602 and each of the components 604 , 606 , 608 and 612 as is well known in the art.
- the hardware 600 operates under the control of an operating system 614 , and executes various computer software applications 616 , components, programs, objects, modules, etc. (e.g. a program or module which performs operations described above). Moreover, various applications, components, programs, objects, etc. may also execute on one or more processors in another computer coupled to the hardware 600 via a network 612 , e.g. in a distributed computing environment, whereby the processing required to implement the functions of a computer program may be allocated to multiple computers over a network.
- various computer software applications 616 e.g. a program or module which performs operations described above.
- various applications, components, programs, objects, etc. may also execute on one or more processors in another computer coupled to the hardware 600 via a network 612 , e.g. in a distributed computing environment, whereby the processing required to implement the functions of a computer program may be allocated to multiple computers over a network.
- routines executed to implement the embodiments of the invention may be implemented as part of an operating system or a specific application, component, program, object, module or sequence of instructions referred to as “computer programs.”
- the computer programs typically comprise one or more instructions set at various times in various memory and storage devices in a computer, and that, when read and executed by one or more processors in a computer, cause the computer to perform operations necessary to execute elements involving the various aspects of the invention.
- processors in a computer cause the computer to perform operations necessary to execute elements involving the various aspects of the invention.
- the various embodiments of the invention are capable of being distributed as a program product in a variety of forms, and that the invention applies equally regardless of the particular type of machine or computer-readable media used to actually effect the distribution.
- Examples of computer-readable media include but are not limited to recordable type media such as volatile and non-volatile memory devices, floppy and other removable disks, hard disk drives, optical disks (e.g., Compact Disk Read-Only Memory (CD ROMS), Digital Versatile Disks, (DVDs), etc.), among others, and transmission type media such as digital and analog communication links.
- recordable type media such as volatile and non-volatile memory devices, floppy and other removable disks, hard disk drives, optical disks (e.g., Compact Disk Read-Only Memory (CD ROMS), Digital Versatile Disks, (DVDs), etc.
- CD ROMS Compact Disk Read-Only Memory
- DVDs Digital Versatile Disks
- transmission type media such as digital and analog communication links.
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US20110149737A1 (en) * | 2009-12-23 | 2011-06-23 | Manikam Muthiah | Systems and methods for managing spillover limits in a multi-core system |
US20110153831A1 (en) * | 2009-12-23 | 2011-06-23 | Rishi Mutnuru | Systems and methods for mixed mode of ipv6 and ipv4 dns of global server load balancing |
US20110161500A1 (en) * | 2009-12-23 | 2011-06-30 | Sreedhar Yengalasetti | Systems and methods for managing ports for rtsp across cores in a multi-core system |
US20120047253A1 (en) * | 2008-03-28 | 2012-02-23 | Microsoft Corporation | Network topology detection using a server |
US20150312111A1 (en) * | 2014-04-28 | 2015-10-29 | Motorola Solutions, Inc | Apparatus and method for distributing rule ownership among devices in a system |
US20160050118A1 (en) * | 2014-04-28 | 2016-02-18 | Motorola Solutions, Inc | Apparatus and method for distributing rule ownership among devices in a system |
US9491148B2 (en) * | 2014-07-18 | 2016-11-08 | Facebook, Inc. | Establishing a direct connection between two devices |
US20170279891A1 (en) * | 2016-03-28 | 2017-09-28 | Samsung Electronics Co., Ltd. | Automatic client-server role detection among data storage systems in a distributed data store |
USRE47843E1 (en) * | 2006-02-17 | 2020-02-04 | Canon Kabushiki Kaisha | Communication apparatus and communication layer role deciding method |
WO2020031157A1 (en) * | 2018-08-10 | 2020-02-13 | Nokia Technologies Oy | Method and apparatus for network function selection scheme in service based architecture of communication network |
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